Rotating hook mechanism for boot or shoe sewing machines



2 Sheets-Sheet 1.

(No Model.)

I). MILLS. ROTATING HOOK MECHANISM FOR BOOT OR SHOE SEWING MACHINES,

P az'e nt eq June 21, 1892.

(No Model.) 2 Sheets-Sheet 2.

D. MILLS. m ROTATING HOOK MECHANISM FOR BOOT 0R sHOE SEWING MACHINES.No. 477,433. Patented June 21, 1892.

UNITED STATES PATENT Grrrcn.

DANIEL MILLS, OF PHILADELPHIA, PENNSYLVANIA.

ROTATING HOOK MECHANISM FOR BOOT OR SHOE SEWING MACHINES.

SPECIFICATION forming part of Letters Patent No. 477,433, dated June 21,1892. Application filed October 6, 1891. Serial No. 407,939. (No model.)

To all whom it may concern:

Be it known that I, DANIEL MILLs, a citizen of the United States, and aresident of Philadelphia, Pennsylvania, have invented certainImprovements in Rotating Hook Mechanism for Boot or Shoe SewingMachines, of which the followingis a specification.

My invention relates to improvements .in machines whose generalcharacter is set forth in my United States Patents Nos. 93,731, 96,944,and 97,951, of 1869, No. 101,644, of 1870, and No.127,123, of 1872, andEnglish Patents No 1,237 of 1870, Nos. 937 and 2,899 of 1871, No. 4,279of 1875, and No. 1,160 of 1876. The machines described in thespecifications of said Letters Patent are designed for sewing a welt tothe insole and upper for stitching the outsole to the welt, and also forsewing the soles to the uppers of turned shoes, no one of the machines,however, being adapted for the proper performance of all of thesedifferent classes of work. The characteristic features of the mechanismin said machines are a curved needle which has a reciprocating motion orpartial rotation to and fro around an axis and operates either with orwithout an awl and with a needle-shield, a looper, a feeddog, a back orbottom gage, and in the case of the lock-stitch machines with adiscoidal bobbin, a hook for carrying the thread over the same, andother devices actuated by suitable cams, the whole of the mechanismbeing supported in a strong head placed on a stand in sucha manner as topermit the workto be properly presented to the sewing mechanism.

My present invention relates to a machine for performing all of thedifferent kinds of work above noted, the improvements having especialreference to the mechanism for rotating and longitudinall moving thehook which carries the loop of needle-thread over the discoidal bobbin,and said improvements comprising mechanism for imparting to the hookintermittent movements of rotation in the same direction and for lockingitbetween such movements; also means for imparting the lateral movementto the hook-shaft, and permitting the adjustment of the hook from ortoward the needle; and also means for starting the rotation of thehook-shaft by a gradual or accelerating motion, so as to prevent shockor jar in the movement of the same or in the action of the gearing foroperating it.

In the accompanying drawings, Figure 1 is a front view of sufficient ofthe machine to illustrate the invention, the parts to which theinvention relates being shaded to give them greater prominence. Fig. 2is a transverse section on the line 1 2, Fig. 1, looking in thedirection of the arrow 1. Fig. 3 is an end view looking in the directionof the arrow 2; and Fig. 4. is a transverse section on the line 3 1,Fig. 1, looking in the direction of the arrow 3. v

The two parts A A of the head are bolted together and have bearings forthe drivingshaft 0, which carries the various operatingcams of themachine, Z1 being the vibrating needle-lever; d, the needle-shield; e,the feeddog; f, the feed back gage; f the needle back gage; j, therotating hook, and k the discoidal bobbin.

The intermittcntly-rotating hook 7' for carrying the thread around thebobbin 7c is secured to the front face of the hook-shaftj and on saidhook-shaft 3' is a spur-gear 7' which is provided with a certain numberof teeth and a concave blank space 7' the radius of the blank spacecorresponding with the convex radius 3' of the driving-disk B on theshaft 0. (See Figs. 2 and 3.) The disk B is provided on its peripherywith a number of teethj equal in number to the number of teeth in thehook-shaft spur-gearfi, so that as the said disk 13 is continuouslyrotated intermittent forward rotating movements will be imparted to thehook-shaft and the latter will be locked between such movements byreason of the engagement of the curved face of the disk B with theconcave face J of the hook-shaft spur-gean In order to prevent thewearing of the parts and the noise which would result from the directengagement of the rotating spur-segment j with the pinion 7' while thelatter is at rest, I impart movement to said spur-pinionj before thespur-teeth j reach such position as to intermesh therewith, thismovement being effected by means of a lever j, hung to a stud 7' on theframe and adapted to act upon. a lug or projection j on the face of thepinion 3' this lever having an anti-friction roller j, acted upon by acam j, Fig. 2, and by a spring j, which serves to hold the levcrnormallyin position for the action of said cam. Just before the first tooth ofthe spur-segmentj reaches a position to strike the end of the concaveportion of the pinionj the leverj is acted upon by the cam 9' and inturn acts upon the lug or projection j of the pinion 7' so as to imparta slight forward motion thereto, such motion being permitted, owing tothe fact that there is in advance of the first tooth of the segment j arecess j". The cam j is so formed that the first movement imparted tothe lever j is a slow and gradual movement, which rapidly increases inspeed after the lever is in contact with the stud 9' so that, while thelever is brought slowly into contact with said stud and starts themovement of the pinion j slowly, the movement of said pinion isaccelerated after the start, and by the time the spurj begins to meshwith the pinion the latter is traveling at the same surface speed as thespur-segment. Hence the movement of the hook is started easily andgradually and without any jerk or noise. To still further lessen thetendency to noise, the concave portion j of the pinion j is composed inpart of a rawhide block f and when, after the rotation of the pinion f,the concave portion of the same is brought into position to receive theconvex portionj of the drive-disk the block 9' prevents any noise, suchas would be caused if the convex surfacej and concave surface 9' wereboth wholly of metal.

The hook-shaft 7' has a motion toward and from the needle, so that thehook will approach to the center of the needle-path to catch the loop ofneedle-thread and will then be withdrawn to its normal plane ofrotation, and this lateral movement of the hook-shaft is effected bymeans of a camj, formed upon the shaft, as shown in Fig. 1, said camengaging with a tongue or finger f, which is carried by a set-screwy"adapted to a threaded opening in the side of the head, a secondsetscrewj being adapted to a threaded opening in the fingerj and beingseated in a recess in the head, as shown in Fig. 1, so that it not onlyserves to hold the fingerj and prevent it from turning when the scrcwjis turned, but also serves to lock the finger 7' longitudinally-that isto say, in the direction of movement of the hook-shaft. Hence the saidfinger is rigidly held in position. By manipulating the set-screws,however, the fingerj can be very accurately adjusted, so as to eifectacorrespondingly 'accurate adjustment of the hook-shaft and its hook, andthus cause the latter to work up to the center of the needlepathwhatever the size of the needle may be, this movement of course beingentirely independent of and having no elfect upon the inand-out movementof the hook-shaft, due to the engagement'of the cam j with the finger.By imparting an intermittent rotating movement in the same direction tothe hook,

whereby the thread is passed over the bobbin, I am enabled to operatethe machine more rapidly than those in which a vibrating orback-and-forth movement is imparted to the hook, as no time is lostwhile the hook is receding to its first position after passing thethread over the bobbin. intermittent rotating movements always in thesame direction, moreover, causes less wear of parts and less noise thanavibrating hook.

The hook-shaft spur-pinion is made hollow or recessed at the face forthe reception of the bobbin-holder which has a spindle k extendingthrough the hook-shaft and held at the rear end by an arm 70 secured tothe frame A by a set-screw k (See Fig. 3.) Through the spindle k extendsa pin 79 which has near its front end a collar is" and at the rear end apin 71: which is adapted to the slotted arm of a lever k hung to a pin70, and acted on by aside cam 70 and by a spring 70, as shown in Fig. 1.A longitudinal reciprocating movement is thus imparted to the pin 70 andthe collar k of the same is caused to press the bobbin 7a firmly againstthe retainer-plate Zwhile the rotating hook is first applying the loopof needle-thread to the bobbin, the subsequent retraction of the pin 76permitting the bobbin to lie loosely between the bobbin holder andretainer, so that the loop can be readily drawn over the bobbin.

The mechanism for operating the needle, awl, needle-shield, feeding, andwork-supporting devices, pull-back, 850., form the subject of separateapplications filed by me of even date herewith, Serial Nos. 407,943,407,941, and 407,940. Hence these parts are not referred to at length inthis specification.

Having thus described my invention, I claim and desire to secure byLetters Patent-- 1. In a boot and shoe sewing machine, the combinationof the needle, the bobbin, the hook, the hook-driving mechanism forintermittently rotating said hook in the same direction around thebobbin, and mechanism for longitudinally reciprocating the hookshaft inits bearings, substantially as specified.

2. In a boot and shoe sewing machine, the combination of the needle, thebobbin, the hook-shaftand its hook, a pinion on the shaft havingalternating toothed portion and plain concave segment, adrivingearhaving alter nating toothed portion and plain convex segmentfor engaging With the toothed portion and concave segment of the pinion,and means for rotating said drivegear, whereby the hookshaft hasintermittent forward movements of rotation around the bobbin, withperiods of dwell during which it is locked, substantially as specified.

g 3. In a boot and shoe sewing machine, the combination of the needle,the bobbin, the hook-shaft and its hook, a spur-pinion. on saidhook-shaft, the spur scgment for-engagement with said pinion, and alever and cam where by the initial movement is imparted to the The hookhaving hook-shaft before the driving-spur segment engages with thepinion on said shaft, substantially as specified.

4;. In a boot and shoe sewing machine, the combination of the needle,the bobbin, the hook-shaft and its hook, a spur-pinion on saidhook-shaft, a driving spur-segment, and a lever and cam for starting themovement of the hook-shaft independently of said spur-gears, said camhaving a differential pitch, substantially as specified.

5. The combination of the needle, the ro- I tating hook, the hook-shaftfree to slide in its bearings and having a cam, a stud or fingerengaging With said cam, and screw-stems for adj usting and locking saidstud or finger, substantially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

DAN L. MILLS.

Witnesses:

EUGENE ELTERIoH, HARRY SMITH.

